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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2a6dda1b4de5677ea974546e1d4f424cbed69b8cd196dd46d5edafa2eb3651' 
  AND token = 'PBba8ZLlOAl83AH7UuKq79oYNozeWjmAH5tQRPMPZFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}